Is CVE-2021-40449 actively exploited?

CVE-2021-40449 has no public evidence of in-the-wild exploitation as of 2025-10-30.

What is the CVSS score for CVE-2021-40449?

CVE-2021-40449 has a CVSS score of 7.8 (HIGH severity). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-40449?

Patch guidance is available from microsoft security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-40449.

Fix CVE-2021-40449 - HIGH microsoft windows 10 1507

Q: Which products are affected by CVE-2021-40449?

21 products: microsoft windows 10 1507, microsoft windows 10 1607, microsoft windows 10 1809, microsoft windows 10 1909, microsoft windows 10 2004, and 16 more.

Description

Win32k Elevation of Privilege Vulnerability

CVSS Metrics

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector: local
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-416 · Use After Free CWE-416 · Use After Free

Metadata

Primary Vendor: MICROSOFT
Published: 10/13/2021
Last Modified: 10/30/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

microsoft : windows_10_1507microsoft : windows_10_1607microsoft : windows_10_1809microsoft : windows_10_1909microsoft : windows_10_2004microsoft : windows_10_20h2microsoft : windows_10_21h1microsoft : windows_11microsoft : windows_11_21h2microsoft : windows_7microsoft : windows_8.1microsoft : windows_rt_8.1microsoft : windows_server_2004microsoft : windows_server_2008microsoft : windows_server_2008microsoft : windows_server_2012microsoft : windows_server_2012microsoft : windows_server_2016microsoft : windows_server_2019microsoft : windows_server_2022microsoft : windows_server_20h2

Remediation Guidance

Executive Summary

View on NIST NVD